Author(s):

PK Basavaraja, H Mohamed Saqeebulla, GV Gangamrutha, DS Prabhudeva and P Dey

Abstract: A field experiment was conducted at ZARS, University of Agricultural Sciences, GKVK, Bengaluru, Karnataka to study the effect of optimal rates of nutrient fertilizers through different approach in eggplant production to increase the nutrient use efficiency. The results revealed that the significantly higher fruit yield (37.81 t ha^-1) was noticed in soil test crop response (35 t ha^-1) with IPNS approach compared to inorganic treatment (35.98 t ha^-1) with same target. The significantly higher straw yield (66.49 q ha^-1) was observed in STCR-IPNS (35 t ha^-1) followed by STCR-IPNS (30 t ha^-1) treatment (63.73 q ha^-1). Similarly, significantly higher nutrient uptake was recorded in STCR-IPNS approach followed by inorganic treatment. Whereas, LMH and POP approaches recorded lower nutrient uptake compared to STCR approach due to application of lower dose of fertilizers. The highest nitrogen (13.89 q fruit kg^-1 N) use efficiency (ANUE) was observed in LMH approach. Whereas, in POP approach recorded 12.86 q fruit kg^-1 N where 125 kg N ha^-1 was applied. This might be due lower uptake of nitrogen by eggplant in LMH approach compared to STCR approach. The P and K nutrient efficiency was highest in STCR-IPNS (30 t ha^-1) followed by LMH approach. The highest respond yard stick (RYS) was recorded in STCR-IPNS lower target compared to higher target and other approaches. The performance of eggplant for sustaining the soil fertility status through balanced nutrition was achieved in STCR approach.

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